Oracle Database: Can one user have multiple tablespaces?

Oracle database is a commonly used relational database management system, and many users will encounter problems with the use of table spaces. In Oracle database, a user can have multiple table spaces, which can better manage data storage and organization. This article will explore how a user can have multiple table spaces in an Oracle database and provide specific code examples.

In Oracle database, table space is a logical structure used to store tables, indexes, views and other objects. Each database has at least one table space, which is used to store the system data of the database. For data storage for general users, additional table spaces can be created to better manage and organize data.

To create a new table space, you first need to log in to the Oracle database and execute the following SQL statement with administrator privileges:

CREATE TABLESPACE users_ts
DATAFILE '/path_to_datafile/users_ts.dbf' SIZE 100M
AUTOEXTEND ON NEXT 10M MAXSIZE UNLIMITED;

The above code creates a table space named users_ts table space, data files are stored in the /path_to_datafile/users_ts.dbf path, the initial size is 100M, automatically expanded and the maximum size is not limited. Next, you can authorize the table space to the specified user:

ALTER USER username DEFAULT TABLESPACE users_ts;

In this way, user username will store its objects (tables, indexes, etc.) in users_ts by default in the table space. If a user is required to own multiple table spaces, the user can be assigned additional table space permissions:

ALTER USER username QUOTA 10M ON another_ts;

The above code example assigns the storage quota of table space another_ts to the user username, the limit size is 10M. In this way, user username can store data objects in two table spaces: users_ts and another_ts.

It should be noted that a user can have multiple table spaces, but each object can only be stored in one table space. Therefore, when creating a database object, you can specify which table space to store it in to facilitate database management and maintenance. At the same time, when allocating table space permissions, you also need to set appropriate storage quotas based on actual needs to avoid data storage exceeding the limit and causing errors.

In general, Oracle database allows one user to have multiple table spaces, and table spaces can be created and permissions assigned through simple SQL statements. This design makes database management more flexible and can effectively organize and manage data according to actual needs.

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